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In a recent year, scores on a standardized test for H.S. students with 3.50 to 4.00 grade point average were normally distributed. with the mean of 37.7 and standard deviation of 2.1. A student with a 3.50 to 4.00 grade point average who took the standard test is randomly selected. Find the probability that the student's score is less than 35. Find the probability that the student 's test score is more than 39.8. Find the probability that the student's test score is between 33.5 and 41.9.
Estimate the area under the Normal Distribution from the mean to a z-score of -2.07. Estimate the z-score that corresponds to an area of 0.5557 under the Normal Distribution.
An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Find the 99% confidence interval for µ, the average annual salary ..
The average number of days absent per student per year at West Valley School is 17 days with a standard deviation of 4 days. How many standard deviations from the mean is 6 absent days?
The travel time for a college student traveling between her home and her college is uniformly distributed between 40 and 90 minutes.
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
Find out sample correlation coefficients of (I) age with dry weight, and (2) age with log 10 dry weight. Interpret your results.
Use a 5% significance level to test the claim that there appears to be a difference in the effectiveness of the two diets.
The annual returns, in percentages, on stocks A and B for three possible states of the economy are given in the table below.
Estimating confidence interval for mean value of y and find a 95% confidence interval for the expected average total sleep time for a child of age 12
Consider the following stemplot. The mean of the data represented in this stemplot ?
If statistically significant, do you think the difference is large enough to be important?
My question bout How do I use the TINV function within excel to back out the t-statistic for the test? Why did you use the TDIST function? I know ho to use the TINV function, but what does it mean to back out the t-statistic for the test?
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